Final answer:
The passage does not reveal what is special about Little Erica, leaving it open to interpretation or further exploration.
Step-by-step explanation:
Based on the information provided, it is unclear what is special about Little Erica that only she knows about. The passage describes a curious old woman in the village who had been to Italy and had brought back various items, such as paintings and a flask of water from the Mediterranean. The mention of Little Erica and her connection to Lars Ebbling suggests that there may be a story or secret associated with them, but it is not explicitly mentioned in the given passage.